<!DOCTYPE html>
<title>CSS Anchor Positioning: try-tactic, percentage</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-fallbacks-try-tactic">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #cb {
    position: absolute;
    width: 400px;
    height: 400px;
    border: 1px solid black;
  }
  #anchor {
    position: absolute;
    left: 150px;
    top: 150px;
    width: 100px;
    height: 50px;
    background-color: coral;
    anchor-name: --a;
  }
  #target, #ref {
    position: absolute;
    left: 450px; /* force fallback */
    width: 40px;
    height: 40px;
    background-color: skyblue;
    position-anchor: --a;
  }
  #ref {
    background-color: seagreen;
  }
</style>
<style id=style>
</style>
<div id=cb>
  <div id=anchor></div>
  <div id=target></div>
  <div id=ref></div>
</div>
<script>

// Verify that a given try-tactic + untransformed declaration equals
// a reference element using `transformed` directly.
function test_anchor_flip(try_tactic, untransformed, transformed) {
  test((t) => {
    style.textContent = `
      @position-try --pf {
        inset: auto;
        ${untransformed}
      }
      #target {
        position-try-fallbacks: --pf ${try_tactic};
      }
      @position-try --ref {
        inset: auto;
        ${transformed}
      }
      #ref {
        position-try-fallbacks: --ref;
      }
    `;
    assert_equals(target.offsetLeft, ref.offsetLeft, 'offsetLeft');
    assert_equals(target.offsetTop, ref.offsetTop, 'offsetTop');
  }, `${try_tactic}, ${untransformed}, ${transformed}`);
}

test_anchor_flip('', 'left:anchor(0%)', 'left:anchor(left)');
test_anchor_flip('', 'left:anchor(100%)', 'left:anchor(right)');
test_anchor_flip('', 'left:anchor(50%)', 'left:anchor(center)');
test_anchor_flip('', 'top:anchor(0%)', 'top:anchor(top)');
test_anchor_flip('', 'top:anchor(100%)', 'top:anchor(bottom)');
test_anchor_flip('', 'top:anchor(50%)', 'top:anchor(center)');

test_anchor_flip('flip-inline', 'left:anchor(10%)', 'right:anchor(90%)');
test_anchor_flip('flip-inline', 'left:anchor(calc(10% + 20%))', 'right:anchor(70%)');

test_anchor_flip('flip-block', 'left:anchor(0%)', 'left:anchor(0%)');
test_anchor_flip('flip-block', 'left:anchor(100%)', 'left:anchor(100%)');
test_anchor_flip('flip-block', 'top:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block', 'top:anchor(100%)', 'bottom:anchor(0%)');

test_anchor_flip('flip-inline', 'left:anchor(0%)', 'right:anchor(100%)');
test_anchor_flip('flip-inline', 'left:anchor(100%)', 'right:anchor(0%)');
test_anchor_flip('flip-inline', 'top:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-inline', 'top:anchor(100%)', 'top:anchor(100%)');

test_anchor_flip('flip-block flip-inline', 'left:anchor(0%)', 'right:anchor(100%)');
test_anchor_flip('flip-block flip-inline', 'left:anchor(100%)', 'right:anchor(0%)');
test_anchor_flip('flip-block flip-inline', 'top:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block flip-inline', 'top:anchor(100%)', 'bottom:anchor(0%)');

test_anchor_flip('flip-start', 'left:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-start', 'left:anchor(100%)', 'top:anchor(100%)');
test_anchor_flip('flip-start', 'bottom:anchor(0%)', 'right:anchor(0%)');
test_anchor_flip('flip-start', 'bottom:anchor(100%)', 'right:anchor(100%)');

test_anchor_flip('flip-block flip-start', 'left:anchor(0%)', 'top:anchor(0%)');
test_anchor_flip('flip-block flip-start', 'left:anchor(100%)', 'top:anchor(100%)');
test_anchor_flip('flip-block flip-start', 'bottom:anchor(0%)', 'left:anchor(100%)');
test_anchor_flip('flip-block flip-start', 'bottom:anchor(100%)', 'left:anchor(0%)');

test_anchor_flip('flip-inline flip-start', 'left:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-inline flip-start', 'left:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-inline flip-start', 'bottom:anchor(0%)', 'right:anchor(0%)');
test_anchor_flip('flip-inline flip-start', 'bottom:anchor(100%)', 'right:anchor(100%)');

test_anchor_flip('flip-block flip-inline flip-start', 'left:anchor(0%)', 'bottom:anchor(100%)');
test_anchor_flip('flip-block flip-inline flip-start', 'left:anchor(100%)', 'bottom:anchor(0%)');
test_anchor_flip('flip-block flip-inline flip-start', 'bottom:anchor(0%)', 'left:anchor(100%)');
test_anchor_flip('flip-block flip-inline flip-start', 'bottom:anchor(100%)', 'left:anchor(0%)');

</script>
